Temperature and pressure alarm device.



PATENTED AUG. 28, 1906.

E. L. LEWIS. TEMPERATURE AND PRESSURE ALARM DEVICE.

APPLIOATION FILED AUG. 16, 1905.

l-.llllllll l I l H III II III' 'Ill AIAI v ITN ESSES! BY 4A/27M ATTORNEY UNITED STATES PATENTv OFFTOE.

ELLIOTT L. LEWIS, OF TROY, NEW YORK.

specieation of Letters Patent.

Patented Aug. .28, 1906.

Application led August 16, 1905.4 Serial No. 274,419.

To all whom, it may concern/ Be it known that I, ELLIOTT L. LEwIs, of Troy, New York, vhave invented a new and useful lniprovement in Temperature and Pressure Alarm Devices, of which the following is a specification.

The invention relates to a device for giving an audible signal when the temperature of a liquid being heated reaches a certain limit. It operates when the gas-pressure due to bubbles in said liquid becoming produced at a certain temperature operate to lift an inverted cup beneath which they are confined and through such lifting to sound the alarm. The device is therefore both a pressurealarm and, as stated, a means of indicating` the attainment of a certain temperature of the liquid in which it is placed.

The invention consists in the construction more particularly pointed out in the claims.

In the accompanying drawings, Figure l is a side elevation of the device with its containing vessel in section, the parts being adjusted ready for operation. Fig. 2 is a like view showing the position of the parts after the alarm has been sounded.

Similar numbers of reference indicate like arts.

1 is the base-ring, preferably of wire.

2 is a standard preferably formed by twisting together wires which are separated to form supporting-legs 3. Said legs are connected to the base-ring 1.

At the upper extremity of the standard is formed an inclined loop 5, the parts of which at the end are brought together and bent upwardly, as shown at 6. On the standard is secured a gong or bell 7, and also by means of a chain a ball S. rIhe loop 5 forms a socket in which the ball 8 may be placed, as represented in Fig. 1.

Vithin the base-ring and pivoted eccentrically thereto at 9 is an inverted cup 10. Loosely entering' the wall of the cup on the side opposite to the pivot is a rod ll,which has its upper extremity bent substantially as shown. Also supported. on the cup is an arm 12, on which is adjustably held a weight or nut 13.

In operation the device is placed inavessel 14, containing liquid which is heated from below. rPhe ball S is placed in the loop 5, so that it lies in the bend at the upper end of rod 11,which rod then also enters the loop. The small bubbles of air which form under the cup l0 at a temperature of about 150 are held captive until they accumulate sufficiently to ball in falling strikes the gong 7, and so sounds an audible alarm.

The object of the adjustable weight 13 is to counterbalance the weight of the cup, and thus to regulate the resistance offered by its gravity to the lifting pressure beneath it. In this way the time of lifting of the cup may be accelerated or retarded and in the latter case until temperatures from 180o to 214Co Fahrenheit are reached.

The device is applicable to all cases in the cooking of liquids where warning is desired that a given high temperature has been reached. lt is especially useful in the preparation of infusions, such as coffee, or for sterilizing milk.

l claim- 1. In a temperature or pressure alarm device, a base-ring, an inverted cup disposed within said ring and pivoted at one side thereto, a device supported on said ring for giving an audible signal and means interposed between said cup and said device for actuating said signal by the lifting ofsaid cup.

2. In a temperature or pressure alarm device, a wire base-ring, an inverted cup disposed Within said ring and pivoted at one side thereto, awire standard supportedon said ring, a bell secured on said standard and means interposed between said cup and said bell for sounding said bell by the lifting of said cup.`

3. In a temperature or pressure alarm device, a standard having at its upper end a ring-socket, a loose ball constructed to be received in said socket, a bell supported on said standard. below said socket, an inverted cup eccentrically pivoted to said standard and a rod connected at the lower end tol said cup and at the upper portion bearing against said ball: the said parts being constructed so that when said cup is lifted said rod shall move said ball out of said socket and said ball in falling shall strike said bell.

4. In a temperature or pressure alarm device, a wire base-ring, a vertical support of wire having at its lower portion a plurality of divergent legs each connected to said ring, and at the upper end a wire loop, a loose ball constructed to be received in said loop, a bell secured on said support below said loop, an inverted cup eccentrically pivoted to said IOO ring, and a rod connected at its lower end to said cup and at its upper portion entering said loop andbearing against said ball:l the said parts being constructed so that when said cup is lifted said rod` shall move said ball out 0f said loop ands'aid'ball in falling shall strike said bell. e f L 5, In a temperature or pressure alarm de, vicel mechanism for causing an audible signal a movable inverted cup constructed to be lifted by pressure beneath it, means for vary` ing the resistance of said cup to lifting pres-` sureyand means interposed between saidcup and said signaling device for actuating said, device bythe lifting of said cup. e

6'. Ina temperature or pressure alarm dei' vice, mechanism for causing an audible sig; nal, a movable eccentrically pivoted cup constructed to be lifted bypressure beneath it, means for varying the preponderance of said cupron'its. pivot andnieans interposed between said cup and said signaling device for actuatingy said.4 device luy-the lifting of said cup.

Inrltestimony whereof -I have 'signed my name to this specification in the presence of two subscribing witnesses.

e ELLrojrT L. LEWIS. Witnesses: i i E DENNIS T. SH'E-IAir,v i IDAA M. Lewis. 

